Active blue light leakage preventing led structures

Abstract

The present invention discloses active blue light leakage preventing LED structures. Each of the structure includes a circuit board, at least one blue light LED die, a photo detector and a wavelength transformation layer, wherein the electric circuit on the circuit board receives detection signal from the photo detector and turns off the said blue light LED die accordingly. With the implementation of the present invention, the active blue light leakage preventing LED structure turns off the blue light LED die when it reaches its usage life span limit thus avoiding damage to human from the massive release of blue light.

1 - 5 . (canceled) 
     
     
         6 . An active blue light leakage preventing LED structure, comprising:
 a circuit board having an upper surface;   at least one blue light LED die provided on the upper surface and electrically connected to the circuit board;   a photo detector provided on the upper surface and electrically connected to the circuit board, configured to detect a back scattering light of the blue light LED die and to generate a detection signal; and   a wavelength transformation layer formed to cover at least a light emitting surface of the blue light LED die,   wherein the circuit of the circuit board is configured to detect the detection signal and turn off the blue light LED die accordingly.   
     
     
         7 . The active blue light leakage preventing LED structure of  claim 6 , wherein the wavelength transformation layer is phosphor powder layer, a quantum dot layer, or any material layer formed with photoluminescence material. 
     
     
         8 . The active blue light leakage preventing LED structure of  claim 6 , wherein the wavelength transformation layer is a yellow color phosphor powder layer, a red-green mixed color phosphor powder layer, or an orange-green mixed color phosphor powder layer. 
     
     
         9 . The active blue light leakage preventing LED structure of  claim 6 , wherein the photo detector is configured to detect a back scattering light generated from the blue light LED die and reflected from the wavelength transformation layer. 
     
     
         10 . The active blue light leakage preventing LED structure of  claim 6 , further comprising a packaging lens provided on the upper surface and covering the blue light LED die, the photo detector and the wavelength transformation layer. 
     
     
         11 . The active blue light leakage preventing LED structure of  claim 6 , wherein the wavelength transformation layer is further formed on the upper surface to cover the blue light LED die and the photo detector. 
     
     
         12 . The active blue light leakage preventing LED structure of  claim 11 , further comprising a packaging lens provided on the upper surface and covering the blue light LED die, the photo detector and the wavelength transformation layer.